Not sure how long it will last but if you download the trial you get 2 free characters and the achievements are available to unlock.The achievements look easy enough and got told it takes about an hour to get around 500 points.

I put just over an hour into it this morning and got 550 another 210 is possible if i put another hour into it so very easy button mashable 700-750 the rest of it you will need to learn so moves .Only achievement not possible in the trial is see 8 characters losing poses as you only get 6 characters in the trial (4 normal characters and 2 only available for a limited time).

Cheers for the heads up. Will download the trial when I get home. Apparently this is possible to 1k on the trial. People on a different site are saying you can get the other two losing poses from the tutorial